Distributor for pulverized coal feeding systems



Dec. 18, 1934. J. E. KENNEDY ET AL 1,985,099

DISTRIBUTOR FOR PULVERIZED COAL FEEDING SYSTEMS Original Filed Feb. 4, 1929 2 Sheets-Sheeh 1 fl f 2! ,z' 1 30 V O Z4 I l4 I 1/ '59 INVENTORS J. .fl Paned 5 y H w. Jo wan Mr A NEY DISTRIBUTOR FOR PULVERIZED COAL FEEDING SYSTEMS Original Filed Feb. 4 1929 2 Sheets-Sheet 2 INVENTOR$ P/ a .e

J- 5. Kennedy MJah 80/? BY 9 9 1 AT ORNE Patented Dec. 18, 1934 -'July1 0,1'930,Serial nou etzte" 2Clain1s. (al aca- ,5

rmsizivenuon relates tdth' distribution of pulverized Iuel, 'such as coal, transported '01 con ye'yedf in an, air strea n from a souree ot supply, a's' pulverizing apparatus or astorage bin, to a 5; place of 0011 01118titan; as a burner or burners leadink intothe; combustion chamber of a furnace orfgfurn aceslf the} application being a. substitute io'rpur application tiled February 4,1929, .Serial .It' is th'eobiect of the'present invention to, effect a di'strihutionpf thest'ream of a main ccnduit to branch donduitsfso that, each of the branch streams willhaye substantially the same volume or idensitypfthe pulverizedfniaterial or solids,

nterpo ed be w ifmai c n it a r h qOndmt$411e qingth re ro i u e 21s. ,a w' rlp e' at h fib p of g@ i e 11]. ea lyin' s c iq c wi he. a

3Q J t means tor connecting the branch conduits with Y ent Q Ija, fluid pressurernotor for actuating the sa etfa df, t

figure j 3 is a; cross f's'e'ctional viewitakenpn the i e,3f3 .0 a lbb i min we. d ipn pljlthe arrews' 'tof show the; arrangement jot the the main conduitthrough the" improved 'di's'tfipu'; trmeans. .zi

' In'thej rawin g's' therefisillustrated an e rn bot ii- 35 nient of the inventiongshdwn mterposed between nd in; thev wnne'q iq P {m cchd wi h branch cpn'duits inj ai'pneuniatic system for the ins nsit v f r conve in f rfz c l i suspension in an air'streamironi source of 49 sppplyhw ay c se anu ver nelan paratus or' a'. storage-bin, to .a'burner or burners 'iorfcombustion'in' a furnace orfurnaces, the pulverizedsmaterialin suspension in the air stream being delivered by a. fan (not'shown) to a. main conduit} and distributed from said conduit to a pluralityot branchflconduits'5 in the present instance shown'as three in number, to the outlet ends, "of which branch conduits. the burners are 59 '-"'In'-"p'ulyerized' coal feeding systems of this cha'racter' difiicultyhasfbeen experienced the distributing of aneair' stream from the main conduit t6 branch conduits in 'maintaining the respective I branch streams with an equal density were" a the'pa's sageloffthe stream through h m n? bn 'it o it n t as u e an? unequal distijbhtigfifi th oughout the 'c r oss sec-i tion of the stream with the result that the stream" is composed of" strata, having different density of pulverized material n soliddfand in the dis tribution of the main Q stream to the branch streams this'unequal density of'the solids is maintained with the result that the branch streams do not have the same 'densityof the combustible solids and abrancwsti'eamorystreams may be so deficient in combustible solids that propercom bustio'n "not take place "atftheiburner. v

L'his disadvantagefis'pyercome bythe present i ntion b ripe n h t n commu st d bet e n th 'mamxa q t e bra u t i did c ihef an e ivefi gfl h eam r m; .t ,e'im in to he br ihnfi s; in n: termittent'seguen 1 E61 this p rpose the'branch o u s r i'cqnh pted' ith t e m i c n i by a I casing "of truncated'conical form "open at the mal 'e d'an ayi fvilmdr cal por i n 7.29 said end whereby it isfc'onnected with the main conduit" 41' in co-axial and concentric relation by en a i an se u in t ylin r ca po tio i'o'f e asin in {a flange [c ar 8,f h fl nged whichbollar?isadapted to abut the flangeof a, colianf9 "mounted upon thefmain conduit and'j'sef curing the' collars'together by'bolts passed through br e i sin/ hvecq l tfi ng s: A ate 0 o larger diameter than the larger end of thecasing is secur d'tp sai nd i'the c s yibpl a in in 'openin gs saidplate and a 11 mounted.

fupon said end oi the casing; fThefplate has a series oi openin'g's 12 equal in number to the numbe'r j'ef thebranch co'nduitsto be connectedwith the m ainconduit, the present instance three in number, idfopeningsjbeing substantially'of segnentaliorni and cireurnferentially disposed about th'e'axi'spt theeasingflwiththe outer and inner walls arranged in fconcentricarcs and the outer wall arranged in line with the wall 'of the casing; The branch conduits'are'ccnnected with the openingdnsaid'plate by connectors having a portion 13 and at which end they are connected with the plate 10,"the entrancejtofthe passage throughthe connectors at said end being'shaped to coniormtov the'openings inthe plate lowith the opposite end walls convergingjto a cylindrical portion Mat the opposite end to which the branch conduitsj.areconfiected. The casing may be supported" by coi'n ecting extended portions thereof to the beams jof asupporting structur,e,"as M15" e sx'eeeeerieq s9 1ds.; h being i tm qr a i .iQ- F off communication between the main and branch conduits to direct and deliver the stream from the main conduit to the branch conduits in intermittent sequence is arranged in the casing 6, and

comprises a second casing 16 revolubly mounted in and'shaped to conform to thecasing 6 and with the walls of the casings in slightly spaced relation. The casing 16 has a cylindrical portion 1'7 arranged in overlapped relationto a cylindrical pended from the casing through a conduit conportion 18 extended from a conical portion 19. of a sleeve and the latter portion having a laterally extending flange whereby thesleeve issupported by clamping the sleeve flange between the flanges of the collars 8, 9, the sleeve constituting a con-- tinuation of the main conduit 1. The larger end. of the casing 16 is closed by a plate 20 arrangedwith an opening 21 by cutting a recess in the peripheral portion of the plate shaped to conform to the opening 12 in plate 10, said opening being eccentric to the axis of the casing and by the revolving of the casing moved in 'an orbit coincident with the openings 12 sothat said opening is brought'in intermittent sequence'into communication with the openings 12, thefclosure plate 20 operating through the revolving of the casing to shut. off the branch conduits in intermittent sequence. A partition plate. 22 is secured within and extends longitudinally and diagonally of the casing16, oneend of said .partition being shaped forming in effect a revoluble conduit.

The casing 16 is revolubly mounted'in .the easing 6 by a hub 25 fixed axially in an opening in the plate 20 to extend from-opposite sides thereof and engaged upontheendof a shaft 26 and keyed thereto, as at 27,-to rotate with the shaft and held against axial movemention the shaft by set screws 28. The shaft is journalled, preferably by anti-friction bearings 29, 29', inth'e'bore of a sleeve or bearing member 30 fixed tothe closure plate 10 for the casing 6. The shaft is held against axial displacement by seating the one bearing 29 against a shoulder formed by, areduced portion of the bore extended through the end of the sleeve and a shoulder on the shaft engaged by said bearing, and the other bearing 29 abutting a shoulder on the shaft and retained in the sleeve ,bore by a nut 31 threadedinto the top of the sleeve bore in abutting relation to the bearing 29?. By this ar rangement of bearing mounting there, is provided a space within and between the sleeveand'shaft which may be packed with lubricant, and to pre vent the lubricant from oozing out from the bearing a stuffing box is arranged at one end of' the bearing, and the nut '31 carries packingina recess therein. U

Means are provided to rotate the shaft and thereby the casing 16, shown as a fluid pressure motor, comprising a cap shaped casing32 carried by the bearing member or. sleeve 30, the open end of which is closed by a plate 33. The shaft is extended into the casing through a stufiing box 34 with the rotor of the motor, comprising a wheel having vanes or, pockets" disposed about the periphery, mounted on the reduced end of the shaft within the casing, by keying and a nut threaded onto theshaft. The casing is arranged with openings 36, shown as three in number, for the passage of the motive fluid, said openings being through the peripheral wall of the casing and arranged in a plane tangential to the periphery of the rotor. :These openings are in line with openings through bosses 37 arranged 'fonthe removable mounting therein of connection means 38 for conduits for connecting the motor with a source of motive fluid. The motive fluid is exnected with an outlet 39 centrally through the plate 33..

In the distributing and feeding of pulverized coal in suspension in an air stream and the delivery of thesame for combustion to a plurality of burners in pulverized coal feeding systems the pulverized coal is drawn from the source of supply bya fan and delivered by the fan in a single stream or column to a main conduit, and the stream from said conduit is split or separated and delivered toa plurality of branch conduits connected with. said main conduit, andvto which,

branch conduits the burners are connected. In

such delivery systems there is so much back prese,

sure exerted on'thefan with the result that not only is considerable power required to operate the fan but the fan becomes quickly worn requiring the in delivering the same to the branch conduits is not separated but the entire volume of thestream is, delivered to eaohof the branch conduits. as successive impulses. As the, distributor is revolved and communication is established between the main conduit vand a brahchiconduit through an opening 12 in theplate 10 the other openings through said plate, and thereby the other branch conduits, are shut off fromthe main conduitby the plate 10 effectively pre'venting pressures the branch conduits from exerting'back pressure upon the fan, thereby. not only requiring less power to operate the fan but assuring the delivery of a stream to each of the branch conduits having an. equal density of" solids. Furthermore, 'by the connecting ofthe main conduit in intermittent se uence with the branch conduits the de: livery of the material to and through the branch conduits is in effect by impulses or impelling f orces, which operate to reduce to a minimum the tendency of creating back pressure forces not only the branch. conduits but also in the main conduit. I

While we have illustrated and described one embodiment of means forcarrying out the invention it will be obvious that, various modifications may be made in construction and arrangement of parts, andthat portions of. the inventio'n may be used without others and comefwithin' the scope of the. invention. f Y

.I-Iaving thusdescribed .my invention, I claim: I 1. 'In means for distributing a pulverized material carrying air stream into aplurality of branch streams, a main conduit, a casing connected with the main conduit and having a plurality of outlet openings adapted for connection of branch conduits thereto, continuously revolving means in the casing at all times in communication with the main conduit and operative to connectand shut off the mainconduit with the outlets of the casing in successivesequence, and a fluid pressure motor mounted on the exterior of the casing and having an operative-connection with the rev- .oluble means to actuate the same. v I

2'. In means for distributing a, pulverized material carrying air stram'into 'a plurality of 10 the casing and operatively connect the same with the revoluble means comprising a hollow hub arranged on the revolving means engaging an opening in the casing into which the motor shaft is extended and secured thereto, and a bearing member fixed to the exterior of the casing in which the motor shaft is mounted to rotate and held against axial movement.

JOSEPH E. KENNEDY.

HERBERT W. JOHNSON. 10 

